docs: def _endless_page(self, number, label=None):
          """Factory function that returns a *EndlessPage* instance.
  
          This method works just like a partial constructor.
          """
          return EndlessPage(
              self._request,
              number,
              self._page.number,
              len(self),
              self._querystring_key,
              label=label,
              default_number=self._default_number,
              override_path=self._override_path,
          )